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Hello @bandit285
There is no second key on this level, even though many players believe there should be one. Unlocking those chests in the bottom right hand corner is impossible. Instead, feed the frog until it starts flashing, and move it to release the last dragon. Place the frog not on the locked chests nor on the dragon itself, but on the empty square just above the dragon, as shown below.
Please check out this video as well:
Good luck!